Mineral Information and Data:

Chalcanthite
CuSO4 • 5H2O [CNMNC approved formula]

Named from the Greek for copper and flower.

IMA status : Valid species (Pre-IMA Ancient) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
29.06.07.01  
  (29) Hydrated Acid and Sulfates
  (29.06) where A XO4 · x(H2O)
  (29.06.07) Chalchanthite Group (Triclinic: P-1)
  
Nickel-Strunz
(10th edition) :
07.CB.20
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.C) Sulfates (selenates, etc.) without Additional Anions, with H2O
  (07.CB) With only medium-sized cations
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 7.16 Ǻ, b = 10.71 Ǻ, c = 5.96 Ǻ, α = 97.6°, β = 125.3°, γ = 94.3°
Crystal Habit: Crystals short prismatic or thick tabular; stalactitic; fibrous veinlets; massive, granular
Twinning: Rare on {010}, cruciform
  
Color: Pale blue to deep blue, greenish blue, greenish
Diaphaneity: Translucent
Luster: Vitreous to resinous
Hardness (Mohs): 2.5
Measured Density: 2.286 g/cm3
Cleavage: 2; {110} perfect, {110} traces
Tenacity: Brittle
Streak: White
  
Geologic Setting: A secondary mineral in the oxidized portions of copper sulfide deposits, commonly
of post-mining formation; rarely as a fumarolic deposit.
Mineral Association: Melanterite, fibroferrite, rhomboclase, epsomite, goslarite, pickeringite, retgersite,
morenosite, brochantite, gypsum.
  
Synonyms/varieties: Blue Stone, Copper vitriol, Sulphate of Copper
Other Properties: H2O Soluble.
Comments: Metallic taste; dehydrates in dry air.

 

Chalcanthite
Origin: Posey mine, San Juan Co., Utah, U.S.A.
Sample size: 7 x 4.5 x 6 cm
Photo: Tom Loomis

 

Chalcanthite
(zoom-in of above)

 

Chalcanthite
Origin: Majuba Hill mine, Pershing Co., Nevada, United States
Sample size: 4 x 2 x 2 cm
Photo: Tom Loomis

 

Chalcanthite
(zoom-in of above)

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